Box construction



C. H. S'HAFER.

BOX CONSTRUCTION,

APPLlc/mon FILED SEPT. 27, |920.

Patente May 30, QZ

mation materially' changed. The material is also bendable along thelines transversely of its flutes or cells but such bending often. tendstot break one or the other of the sheets and disrupt the cellularformation of theI material.

r.lo reinforce or strengthen such a threeply cellular piece of materialat its bends, Weak points or 'Wear spots, l use a similar piece ofmaterial having sheets 5 and 6 corresponding to the sheets 1 and 2 and asheet 'i' corresponding to the sheet The material composed of the sheets1, 2 and 3 may beconsidered as a supporting piece of mate-v rial and thematerial composed of the sheets 6 and. Y as a reinforcement or insert.The reinforcement may be placed on the edge of any portion of thesuppiorting piece of materlal and subjected to pressure untilv thereinforcement, in part or as a Whole, is countersunk. For instance, asshown in Fig. 4, the supporting and reinfrcing pieces of material haveedge portions thereof one on the other and. this is attained byoverlapping the edge portions of 'the .material and `suloj;acting thesame to 'pressure until the `edggge or marginal portions are reduced toa combined thickness equivalent to the body.

of "one piece of material. in other Words,

4pressure is appliedruntil the marginal por tion of each piece ofmaterial is iattened and compressed into a thickness which permits ofone piece of material remaining substantially flush with the other, thesheets l. and 5 being in a common plane and the 'sheets 2 and 6 in asimilar plane parallel to the sheets 1 and The marginal por Iion of the.sheet 2 and the marginalV portion of thel sheet 5 are brought intoparallel rela- Vtion and, in consequence of pressure having beenapplied. to produce this result the cellular formation of the compressedportions of the material is changed.

The conformation of the cells 4 is such i that the major axes thereof,'considering a cross sectional view, are at a right angle to the sheetsor side Walls of the material, but after the material is subjected topressure the cells are more or less collapsed so that the mailer axesare parallel to the sheets or Walls of the material. ln' consequence ofsuch collapse the'original three-ply piece of material is converted intoa five-ply piece of material and when the marginal portions of the 'twopieces of material are held to` getlier, as shown in Fig. Ll, there areten plies of material Where the two pieces are joined.

Rolls, presses or any suitable means may be employed. for subjecting thesupporting and reinforcing materials to pressure preferably rolls,because the passbetween rolls can be set for the thickness of the.supporting piece of material and then the rei-nforcing piece of materialplaced in proper relation to the supporting piece of material to bejoined thereto. Juucture may be effected by the use of glue or a.suitable udhesive, although mechanical means may be employed in someinstances, and in using rolls to change the cellular formation andsmooth out .the overlapping relation of two pieces of material, it ispossible to place the reinforcing material directly on top of asupporting piece of material and have it press into or countersunk, asan insert, relative to the supporting piece. of material. lt is in thisconnection that pieces of cellular material which have been punctured,cracked or otherwise injured may be reinforced by patches or insertsapplied thereto.

lfVith this preliminary understanding of the manner in which a piece ofsupporting material may be reinforced, reference will now'be had toFigs. l, 2, 3 and 5 showing a conventional form of paper container orbox made from a blank 8 provided with slots or slits 9 and adapted to bebent or folded on the dotted lines l() so asto form a rectangularstructure haring a bottom wall ll, side Walls 12 and lids 13 which closethe structure and form the top thereof. .ln bending the blank 8 on thedotted lines l() it is apparent that the cells of the blank material arechanged at the bends and if the material is not weakened at the bends itis subjected to strains.l If the paper box is roughly handled thematerial will give Way at the bends and thus destroy the usefulness ofthe box. To strengthen or reinforce each bend? ing zone of the box lprovide the blank 8 with reinforcing material in the form of strips 14and these strips are pressed into the blank until the exposed surfacesthereof are flush with the wall of the blank, as best brought out inFig. Now, when the blank is folded to provide a box all of the cornersand edges of the box are stiffenrd` just as though a frame surroundedeach Wall of the box. To maintain the blank in its folded box form theconnecting strip 15 may be em# ployed against the other sides of theWall l2 Where the ends of the blank meet, and as furthershown in Fig. 12an angular reinforcing member 16 may be pressed into the walls 12 attheir juncture.

Just how the bent zones of the box are reinforced may be noted in Fig. 5where it will be observed that the original formation of the cellularmaterial is maintained for the body of each ivall. but where the strips1l have been pressed into the Wall the cellular formation is changed toincrease the number of plies and build up the material so that it will'withstand considerable pressure and rough handling before being broken.

There are certain forms of boxes or con` tainers Where the end portionsof the boxes are subjected to greaterwear and tear than other portionsand this has been brought out ilo llt?

